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[Bug libstdc++/50257] [C++0x] unordered_map slow initialization due to huge __prime_list
- From: "paolo.carlini at oracle dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Tue, 06 Sep 2011 09:14:40 +0000
- Subject: [Bug libstdc++/50257] [C++0x] unordered_map slow initialization due to huge __prime_list
- Auto-submitted: auto-generated
- References: <bug-50257-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50257
--- Comment #10 from Paolo Carlini <paolo.carlini at oracle dot com> 2011-09-06 09:14:40 UTC ---
Unfortunately constexpr functions are not going to help here, because of course
a call of such a function is never optimized to a constant unless *the
arguments* are all compile-time constants. In the meanwhile I timed my last
patchlet and definitely isn't worse than the other for the simple testcase we
have, otherwise I think it's much superior from any other point of view
(besides maybe readability but actually I'm using a rather common pattern),
thus for now I guess I'm going ahead with it. Thanks again.